Funding for this research was provided by:
Centers for Disease Control and Prevention
Article History
Received: 12 November 2018
Accepted: 26 March 2019
First Online: 9 April 2019
Compliance with Ethical Standards
:
: The findings and conclusions in this paper are those of the authors and do not necessarily represent the views of the National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention. Mention of any company or product does not constitute endorsement by NIOSH.
: The authors declare that they have no conflict of interest.